I slammed on my brakes. The middle Big Hole was awash with concentric rings. A trico blizzard had incited pandemonium amongst a clan of whitefish, and I was helpless. I didn't have a great trico imitation, so I fished a size-14 Rusty Spinner in front of a size-18 H&L Variant (the bugs were probably about size 22). Both worked, but the big spinner was hot.
And it was like this up, down and across this stretch.
Later, I got a couple whitefish on hoppers (and finally got my first fluvial grayling!). After staying the night on the East Fork of the Bitterroot, I stopped at Rock Creek and Flint Creek on the way home. Not to be outdone, Rock Creek's whitefish amassed for a family portrait, waiting to spoil the next fisherman's dreams.